#![allow(dead_code)]

struct ConvertLrn {}
impl ConvertLrn {
    fn hello() {
        println!("Convert learnning!");
    }
}

#[cfg(test)]
mod tests {
    // use super::*;

    #[test]
    fn type_anno_into() {
        let str = "hello";
        let string: String = str.into(); // 标准转换之一
        assert_eq!(string, String::from("hello"));
    }
}
